Optimal Synthesis of Activated Sludge Wastewater Treatment Plants for Nitrogen Removal (original) (raw)

Abstract

The predenitrification, postdenitrification and combined pre-postdentrification are the most used basic activated sludge wastewater treatment plant configurations for biological nitrogen removal from municipal and industrial wastewaters. In general, the denitrification schemes may require an external carbon source dosage since the influent easily biodegradable COD is consumed by aerobic microorganisms, resulting in a shortage of easily biodegradable COD for denitrification. This is even worse when the fresh wastewater has low COD/nitrogen ratios. However, the excess of external carbon added may result in a deteriorated effluent quality causing increased fines and/or operation costs for the excess carbon that is not used for denitrification, the higher cost for treating an increased amount of sludge for disposal and energy demand for aeration to remove the excess COD. The problem addressed in this paper is the simultaneous optimization of the system structure (process configuration) ...

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